I did some stuff in there a couple of times. Expensive as f**k, and very painful when we did live exercises.
The group I trained with had there sh*t together. It was very cool. But as for airsoft that would be very questionable. They would probably get some laughs if you asked. It would be too small for any kind of gaming, which with a group made up with some of the other posters on these boards would only want to do anyways.